RO High-Pressure Feed Pumping

Overview

Brackish water RO systems in India operate at 10–20 bar feed pressure. Seawater RO systems require 55–80 bar. At these pressures, centrifugal feed pumps lose efficiency rapidly with any variation in feed TDS or permeate recovery ratio, requiring oversized motors and consuming excess power. In Indian industrial settings where electricity tariffs have risen 20–30% over the last five years, energy efficiency in RO feed pumping is a direct operating cost lever.

SEW's Vanguard Series triplex plunger pump maintains consistent volumetric output at high pressure — without centrifugal pump efficiency curves degrading at off-design points. Used for brackish water and seawater RO high-pressure feed in industrial, municipal, and pharma purified water applications.

How It Works

Pre-filtered feed water (after multimedia filter and cartridge filter) enters the triplex pump suction at low pressure (2–5 bar). Three plungers raise feed water pressure to the RO membrane operating pressure — 10–20 bar for brackish water, 55–80 bar for seawater — and deliver it to the high-pressure feed manifold of the first pressure vessel bank. VFD control matches pump speed to system demand, maintaining set feed pressure as permeate recovery varies during operation.

Bare Unit Use

RO system integrators and water treatment EPC contractors order the bare high-pressure feed pump for incorporation into new RO skids or as a replacement for worn centrifugal high-pressure pumps on existing RO systems. SS 316 or duplex SS wetted parts for seawater service. Flow: 40–200 LPM, pressure: 10–80 bar depending on RO application (brackish or seawater).

Skid Package Use

SEW supplies complete RO high-pressure feed pump skids: triplex pump, motor, VFD panel with pressure transmitter feedback, pressure gauge, suction strainer, pressure relief valve, and connection flanges — mounted on a common MS or SS skid frame. Used in: industrial brackish water RO (textile, pharma, food), municipal water treatment plants, seawater desalination (coastal Gujarat, Maharashtra, Tamil Nadu), and pharma purified water systems.

Why SEW

Consistent output at high pressure — positive displacement maintains flow rate at set RO feed pressure. No efficiency degradation at off-design operating points.

VFD pressure control — matches pump speed to system demand. Reduces energy consumption in variable-demand RO systems operating at part capacity.

Duplex SS wetted parts available — for seawater and high-chloride feed water service where SS 316 is insufficient.

Indian manufacturer, Nashik — stocked spares, local service. Critical for water treatment plants where RO downtime directly affects production or supply commitments.